timujinThis concept has been out for a long time, well before this movie. I remember reading aboutprototypes back in the late 90's or early 00's. I think they were looking into it for law enforcementat the time, so criminals couldn't take a cop's gun.

You would still have a problem with legal gun owners accidentally shooting someone while intoxicated. Fortunately there is a solution for this as well. Build a breathalizer into the barrel of the gun. You simply blow into the barrel of your gun. If you are sober, it will unlock for normal use. If you are drunk, it will immediately fire off a round to ensure the problem will never happen again.

Terrydatroll:Secondly, I am sure that the guy breaking into my house with is OWN gun won't be able to shoot me because MY gun has palm reading technology. "One moment while I read your palm! Whirr zzzzz zip...OK, according to you palm reading, you have just been shot by a burglar. Palm signing out..whizz..whirr...zzzz..zip."

Apparently the consensus is that this idea won't work, because today's computers take seconds to process a kilobyte of data, all the while making clockwork noises.